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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15d8c1c788df326d47fad3d06e8a4ebf8dc062eec3094946463f97fdcaee327d' 
  AND token = '2RY61Anp9b0XN6dZfRGdIkOw2E6UJGm4BgtkUSbKv+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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