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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24806b201856dcfd8cd57662221752fd1becbbf4b4b97139c28c9c18962cb62e' 
  AND token = '8gK7/mMGv0axUSJtAvz9xNa5oxVXeXGVFj5pDOuNNPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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