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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '087664f5dfb2acf20b56e494de95d4ee3d7acce42424ee159e905f4e162d6555' 
  AND token = 'TvcrF7qGmHe5Af6PjLXHCU1PigNnahis4NH4xxA/6zY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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