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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '725584ddee89489424880e00db76d88e15974c0bf036d16b63ea0f9ff38e49c2' 
  AND token = 'Q9FWrtK0rilQgkvZToKTJrWSkR3TsBv5V9cExDuvfik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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