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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae5617b9599365b9eaa4eee105625d1f569c1effd634b03ee7a054247a7c8053' 
  AND token = 'VuIdGazqzTof90zFomK7dM03mJ3FhIwMJZ+jdw6QoZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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