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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83b41a92ae73c1e84fc3717e07d3f9885efc69d922d3e63b3b73bb5ab6d9c6a6' 
  AND token = '1tMHdn6OIw6w/NrP8oz62vctnNLKLIuSZdLvHrWwTtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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