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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67a1d41d60000926092d73553c11bcdbc32d13a0bd1333355e1d91c3d19288a9' 
  AND token = 'nEpKWTfS4nRde+0L/JC3x5lEnWgY4PCdkFElZaJ1edU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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