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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f04387aaca35d2addde22ac6ac46872bbb801f0d20f8a8fe6b08d83255cd432b' 
  AND token = 'aA1yHJrpXoxtVasfZ1uJrKFGA+z2Z18GzJw3t01AHaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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