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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab3f11d38ec5dbeb0e2dbecc90ab54eae4ea8aa95726d1396ccb0c2814a312ba' 
  AND token = 'epoGRZ5UTTQ6JV5Sc9A+rr7/6yflYDxiT8QiEK1HsrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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