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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15f1545fa2ff5e7bfdce5f0eca14777cb6b1b1e66688b430fb7e482878babe6e' 
  AND token = 'VuisQ0QltUw1LyboyRXwP4XPl1HvpVG+mPdHa2Nj1ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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