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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af7ea7dda24cee877b8f8e88d7dd5f86713e9492c0f070518c56c5b477b5b796' 
  AND token = 'x5pv/8X0WNO8hUIFqjviDcJbisLhwsL2xJWDZIBcLps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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