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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76890d29b2dbfd8287c46b6188e76d2c7f74c554e414dd0ccd3060f4740c9450' 
  AND token = 'Fsra7cCGNGSHp2bRdNgvPBMmae0Is6fRBX1QSSop7wE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}