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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47cef311c355d6c53343c29b1dd5980db950eaf281810fc11566677327069492' 
  AND token = 'sB6PdnCOQqZc+urJV0VNReme4mx2xop41WVUOV23p9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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