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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f0d54c3c982aa5ebbf70471b5b32a9e03772eae15b86f46b2736422f61d8926' 
  AND token = '9qHDJFo01lxKBstTDeS+Kz7WCxwvcFwPMluz7F9tbbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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