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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb858517fa89810040f8267fbf41a21b6ea85f2710d298a5cc59db381cadae50' 
  AND token = '992tN0iQGpIekhvOWxdqlpW062kJqgPZYJ/66jTcpKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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