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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78409ba0e2689a16500e7e557ba6928b49739daea89921ea6575d00cce541f48' 
  AND token = 'eX7gbdM+EuFapAgvCguLFGlXr2tG86Zp67sb7LD6CP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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