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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '005c8ee94e5a7e6ba8d0ba92cae415b78c54be07dad5347b62710f39d85c8815' 
  AND token = 'krSmwI6gJBat4pHHC85VM9+UFPoq8Ys0tfNQtibdgFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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