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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '236dc3d3edaf63fc7521a9b12a90d60f425c1a83cad9be7f1e25695aa20660bb' 
  AND token = 'D3ZRMRyo2byp4Kne7oPRlX2+cBMyra5/BdS+WMgQ3wM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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