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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3992226adb4b2169afa3afe90286500072bc7d5c35ee540fbc0486949840218' 
  AND token = 'lEOc2fAaH3ydgRRWTS9C2EbkjhNHXRiJh4TPyrmkb3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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