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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a40e6a5a7e96438e0560adb2d07aaa6aacd29cb0b3c4b170002b41def2b93711' 
  AND token = 'LfkyzTdMEU3NIxhuZ0t3YFHKwDro4IixjZXgHk2E9o8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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