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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb38e547600f94c7d48d053f48b34d860502ce10b28dd6bbd6c87e5a8b1ee980' 
  AND token = 'C1DSctDCFNIdR99Br/2sZpHihbFtYzhTHeAd4brHSEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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