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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2155a141f521c28e80f5aa95af163fc4c44d14366dd1e8eddcc5e8601bb5d8f4' 
  AND token = 'd88w6wK4irFxR1o9wlITMJFx5G/buiuODzGl+D3lh5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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