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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57bba36e4f8871981bc880f85e5ad63236fd275b823e3f05a82b41146ccea042' 
  AND token = '/emUrZeTIuuQ3p1fULeMEG8onVnt7hFbbRTucqQnRL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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