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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd90fd5f9d18a330c5c8fbe82969d39b20106ac5b2d09d9c60ff23d9c66dbf852' 
  AND token = 'ZwRCs5py0aWND2G7I5IVng3bsfIhr+z6cr7MRaEYeFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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