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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b5e0b168a94c150dc15bfb61851314ae5be9d3bfd7a99231299e4d4284ca5be' 
  AND token = '2d+frrpCZRVNheCfWQ7iHA9qMdnoLGBiy+tzyRteemM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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