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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b4f53462ea0a0de557efcf5aa5ca75e711c83bc3d9bf5d94587f0731f063474' 
  AND token = 'lNdbaBCyBUg4/7PqA7DWpqpmdV/YU9LUt43fN1I4SVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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