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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa063a90ecd0b6b8ab3bef7f1d31dd4361be1c966ab1b80fd3f7456891027579' 
  AND token = 'DCom8qFyvVxTL2Ub5t4U47BUw+JrrYbRuyagxwu2XO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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