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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b723b9ccb3caa5304f0c69694a65bd4be74128d9dbe142dd4a5e8eed042ca509' 
  AND token = '+341FnExDeW+4O1z0l1ZRaO0mrFk9wuLiHxO44QHD5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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