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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73f7344b1c2359a2508ead0a8eb968c27dde3c86a333b61577e54e3c4c83426e' 
  AND token = '4L5jh50EvKkxfJINb8a97y4IJ5uuoHQ0sPYB+++iV34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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