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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f92885379a1b8f49eb1080daccfe8ed66b6ee615151fb896e56b664eaa0bee1f' 
  AND token = 'ShVN7H1TIuEJs7CKo9YvbZ9eoENmeNaDXUokr1Jqiwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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