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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f01c4c3de7d678b774b2aba1d94d7b600905c526b90a9882f8b1f4187c8b97e' 
  AND token = 'u/FTiLw3x+Lx7TifLNC6YJwVHCcO6tbwsP+f6eO3rkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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