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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c9c6e5fd95778fdaf6b6a2499dc757faa955e9f7f0be385e208b834a96cc9d4' 
  AND token = 'DsHt0KpeSg76uTQz3k8psXtlky1bvk8Vg/GH7AJYf2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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