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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8ae8758d017ce5d6b0ed0215e9ab482ce83a3a43f467bf2ee05df133369d21e' 
  AND token = 'KIF/czK1Av2zsJ20bix5kTvfT02a8q9JC7tJOLnWh28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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