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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef77a4b0e87d28f5b3e6c976685dcb62c188b23bc91b9c27fdee9bd06fdc1bff' 
  AND token = 'MRGi2YrltwjNKK06d+5BM6VFxnFamWj4N3nHXN2PLeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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