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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d1e5ea0909c50e00d49a8f19478453308ac5316bddd30c899b03277641de7e9' 
  AND token = '8rhnsiSE3Xcg+o34oa74bobFov3LOPW/1AGAyH30DXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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