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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91e0a02bfbe9e32d063ae6fa9944ddfda03fd8737dc551955b4a36b2cb7d4fbd' 
  AND token = 'bkROTQfxUCM6pCaTzP+T1eN4kqdHj4iEUMZmvNzk5BA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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