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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fa5157696cfffe55533dca622baea2850fa36027d0fb9d6f82a213ea6ed289c' 
  AND token = 'fC4OFyEpFmrmq98Y9ZFBq2T1h4S81PdrPlR7RjUIfes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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