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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef242d57dd50c9c777064096d18fad652c9ad510bbd76011caf1dcd2f45facca' 
  AND token = '9w3nlPXv576tIGarhEWL49dU0rBvp+ovE4EjrZ2TwYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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