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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '801f23d871bddbca095f26765b28be81f48cf3eec7166ac1383d4d88c005435f' 
  AND token = '2lvZ6rl735iXyAEB4UOd3OIsrB9HuuUuuQlBifZJrng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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