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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e911040eab00b7c85c000a900f896f020557a4e7995d4ea45a6969e19894c00d' 
  AND token = 'rMizermoV4lN8n8yXwYW7ouK6i3W+u5BoJQz732lG0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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