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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84e254193ea44e76cc3fb760c6d11e3de04ce1e49aa49e84c4a3e35813ece924' 
  AND token = 'zqbFFiQ2YiIVF0/TcopYX6baHp/Zh32Se/BSwvOKJTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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