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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94faf144227c92501a43b182091de91e43b8f9756371974777128519b2ad3480' 
  AND token = 'H7SF4SbavWpzO6vxkZ9OZ7XYJMem7wb9Gu9Jo5hny7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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