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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f7ef296efd4b67bc075fa199358139f4396604f503fd269ffe88a8792b26cb6' 
  AND token = 'CgYpxEYN0g+ABLQyz6YohSRxIMuS4Xoci6l3EMT/r3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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