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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b2e7cfccc833471c6a506ad2c47f022d90c44a16e031e20e7aa23050b72fa15' 
  AND token = 'DQef3F51GBWirBBJ+osvuEondyG/VlGiO/SqwW+N86M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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