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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24195f709f5172da280c58a73e6d93078065577a32e8f58bfa084ba2220b2d20' 
  AND token = 'yUr8Q1rNaLuYZxVkuRuVBYplohIPCylxIOAx8dcyTEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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