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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b94621cb80e04a566ed4c72287f708ab30230c45f1f4d9e05bde01eaeacb212' 
  AND token = '8FY36ChrhSZ5G5QjwxF8mt40FJqsnT/kUROyvRQXdTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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