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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91f21efa0b6609075ad33b77791a9fa3d11f68e25a6c9da07adef4422d73493d' 
  AND token = '1gGvfyhY7CbJ57Z0664PUFt86hscBi5jOeFF6UkL1H4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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