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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '542ce9878d0765fb37fc697a8cf62fb7934699820829c90e9907b8bfcd9c169f' 
  AND token = 'lWRnOd7STlgDtFTjAB82PgOQdz8fdSwoefm2xqn/Wjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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