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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cfd8a688272e01725e753a2d6f88ac0ee487ea453e850351328048dbdb1ad89' 
  AND token = 'xCakE4WcWai4P0FzjOO/llhQyYB1B72TxwqyNX17q2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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