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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3019241063001839a57d1a52fd997395fbcd66c50ff7cd8b3ccdc641cc770786' 
  AND token = 'aIbHijzF/qq3bzmb1SdKHoe9KjoOC8xtGi3B4x4zS4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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