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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db198816f1a4335b9c9f55a938c307bb711dc024c38a78af49df34f8171aa5ae' 
  AND token = '+l8/K/wLQsSHQqJPGIRjWlll/Hq1LborK1kuZ8XQbok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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