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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a418492e1886bf47890f901db611c07a0391497c8169ee68a5ea7ff3d726638b' 
  AND token = '5XJMmJrPXxTigqMERnoebkKIeQFTC3G1dQB3euZeYNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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