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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd696943c0ef5ccf67879df1b0033c99c0a9b8b1e3dc2a144c88fa19c87a6d4ca' 
  AND token = 'lwhv0lZPP0czBudNHxkOsa7rmLQCVbGVM97mZzTbn8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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