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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1774744d118458468446931ef46761baefef462fa42c7d8516228cfcea0d42de' 
  AND token = '2g3b2z8bfcD4rqbj3uS+fShs41YYMW+awC+gaD4r8mI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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