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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dec809d45ce597e155a15649e2ae6f2958b4d145563655b36d8a1ce8a1f11d32' 
  AND token = '4MfA8Z9PRJ0IKRwqkprJHsmVGrgnlZP+knUct9DYUW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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