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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad1091922cc1e11807cca659f633c1a737c8264939e8546e44b4e6a3c5efe695' 
  AND token = '44sXDgh4gLwFwGUuWmSURsWIAOH2Lp5rfo+ln9yOMZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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