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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa3dc804515b133e2c0616517d9e9dde648efbdf6d7963b4bc683369cff9b26e' 
  AND token = 'aCHQAdLo2t8l0QmY0Ti8Hiku0TcBYyBT7z0/t5E0ku4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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