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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2af5587f01cd74b7b251844254c632ceeb195b96d071df0c39337e13fa08ad56' 
  AND token = 'mzoRpc4XZtNpiPAra60IgxqfLvtrG5mzdvo0ZYGMtsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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