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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '582a2285869d2fbae20f4599ea7030089f30a5c474183776d9b6bc53e3118447' 
  AND token = '1Zx4pOtyDQPNssYZkw/vD61ZrAQvSpERqprZAdgstAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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