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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '896e460f351d3449bd91e0ef0a072fb71f96628cadd252bd5c0fc906cf423a0f' 
  AND token = 'fMi+9Z1ZG4mFRwtvk4EHfkt0AsvSo7mDT8RcO26bgUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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