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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7535d0e590aab19d566359050ad1037aa91ab23d517fa92fea2bdd4e0b8e51ac' 
  AND token = 'wM4P959C5HWKIwsWFAqpoN2PIQ47jPZubo9RKut4G4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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