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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ead23c20b46149c911cae3fef5e922a87492dcc0f4ab7916919a3195cc0cb7ef' 
  AND token = '480Evd0BBap3pDftsny8GCyEkoGhAR3XhKg0v7NqksM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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