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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6171a67501c1d24bf45834e87fdc72f71391dc4c7dd6f58442020d17277892f2' 
  AND token = 'nNUe4pBV3I1oGH5XjImfucZyWEm/V8LX7HYAlONA//g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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