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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd48795e184905b769b8c1151ad83b4952cc8e9a966b1d61456ad31c728650ac7' 
  AND token = 'IgnWsNwHdNwYJLDtkm0CybDYtE7PtL1obV8gGHDdCSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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