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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee6ad9fe0366d838b1a2f72e0121c596b3aa339f681f971518e0f726b7fd83ae' 
  AND token = 'EzETanPREXM1zdaRwZxUEHpH0KanoveajuW6GYDNERw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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