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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a73bd9152fcc9683452da387964c26d52482e7f4291a0fe083c45bdc4c5ec92a' 
  AND token = 'Rdiqpj3cnmxVWg/GQEEYiu1yT0OAbF19Kgt8SgyGoe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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