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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5072bf5dea1df7d1fe5e7f2db832581282d461dab98d7ef8ad38b5615ea5acad' 
  AND token = '2ZNqRpavT7pvL5VeMp4HEze/hKuoH7AucQuMeuurprM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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