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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77d4d3f272fa69e354c3ef2c9c57e670516703454f149699930aec9149ae4575' 
  AND token = 'uoEnbaiUf6qoHvcp2fD5eC33GZ7v64AXBumAz/YvgDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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