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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ece207397420ae2e1558ac2fbac2003a34b2c5f3ec21ac88d7e95ed0d3f3dc2' 
  AND token = 'p4RjSPpn/l4IoDJintDhVKenLMonM2ROilGGh83ipJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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